AWAKE Beam Line Window:Beam Emittance Blow up Studies

AWAKE Physics Board Meeting

02.07.2014A. Manousos, V. Vlachoudis

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AWAKE WindowIntroduction

AWAKE Physics Board Meeting 02/07/2014

Window: Possible locations.

@ QTSD-QTLD

Beam Parameters: Protons at 400GeV/c Dp/p = 0.1% Np = 3.5 1011 p+ per bunch

1 bunch Gaussian beam Optics Parameters provided by Chiara Normalized Emittances: 3.5mm mrad with dispersion

Geometry: Geometry :

Graphite Cylinder (1.55g/cm3, R=3.5cm, L=0.3cm)

@ QTSD-QTLD

bx 138.599339

ax 10.674844

Dx -0.386052

Dpx

0.030349

by 107.626697

ay -0.023327

Dy 0.072676

Dpy

0.001146

With Dispersion

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AWAKE WindowMirror Position

02/07/2014AWAKE Physics Board Meeting

9.2e+005 protons hit the Mirror

2.9e+008 protons hit the Mirror

300 times larger

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AWAKE WindowMirror Position

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AWAKE WindowMirror Position

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AWAKE WindowMirror Position

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AWAKE WindowMirror Position

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Electrons

Photons

Pions+-

GeV/c

GeV/c

GeV/c

From Pions0

Δ(N

part

icle

s/bunch

)Ε/Δ

Ε

Δ(N

part

icle

s/bunch

)Ε/Δ

Ε

Δ(N

part

icle

s/bunch

)Ε/Δ

Ε

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Conclusions

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Majority of secondary protons still have large energies ~100 GeV -> is this a problem for the mirror?

~100 GeV protons should create a lot of additional secondary particles in that mirror

New Simulations are needed, where the mirror should be included.

Bigger the spot size → Higher the blow-up

Particle maps are available for further tracking studies

Procedure for the evaluation of the Em. Blow up is still under revision

What is really important for what’s downstream?Are the tails important for the plasma cell?Can they perturb the plasma?

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The End..!!

02/07/2014

Thank You !!!

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Backup Slides

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AWAKE WindowBefore Plasma

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AWAKE WindowBefore Plasma

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AWAKE WindowBefore Plasma

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AWAKE WindowBefore Plasma

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AWAKE WindowBefore Plasma

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Photons

Pions+-

GeV/c

GeV/c

GeV/c

From Pions0

Δ(N

part

icle

s/bunch

)Ε /

ΔΕ

Δ(N

part

icle

s/bunch

)Ε /

ΔΕ

Δ(N

part

icle

s/bunch

)Ε

/Δ Ε

Electrons

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AWAKE WindowAfter Plasma

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AWAKE WindowAfter Plasma

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AWAKE WindowAfter Plasma

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AWAKE WindowAfter Plasma

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AWAKE WindowAfter Plasma

02/07/2014AWAKE Physics Board Meeting

Electrons

Photons

Pions+-

GeV/c

GeV/c

GeV/c

Δ(N

part

icle

s/bunch

)Ε /

ΔΕ

Δ(N

part

icle

s/bunch

)Ε /

ΔΕ

Δ(N

part

icle

s/bunch

)Ε /

Δ

Ε